Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc7a2cb666a934d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-05 00:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ff64bee5fce3798a94d8f6a56981695 SHA-1: 8b361c6b0a159e2f5572a97500878ffd24f82a38 SHA-256: adc7a2cb666a934dd8ccc5435b9b6850b62149a57f351306424d81cf3e1cf811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of compromised CMS upload links further supports the malicious nature of the sample, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bisnismedsos.com/userfiles/file/492438993.pdf
    • https://groupburuemas1.com/contents//files/2594624789.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/depiwu.pdf
    • https://addsfly.com/userfiles/file/82775378721.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/501fe2e8a9570914823b5cb1cf65d1fc/6386518889.pdf
    • http://asea-admin.com/_userfiles/file/20210726165554.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/9654774126.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a1e6eccf2e3b03624c1393e2982c90f/suridisakadilesikaw.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fadc0146b---popirogebumav.pdf
    • https://krassimirtaskov.com/userfiles/files/nimipaparamoweketef.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab00150c0.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/dixusapipazepa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab0e2536a0---memavese.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/fosesoxodug.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6i0f55k9rt63a0tjult3aaa4sh/puxenijosapajiwidu.pdf
    • https://agrimal.pl/userfiles/file/80949280991.pdf
    • http://dokumsuzgec.com/userfiles/files/91787981796.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5e935d69---xamelopuxijopiwemo.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/91597888360.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/67857117208.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5000cc6aedbdf8fbb6713bfcf509ecd1/97031029219.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4qdabn2ci4bcu9dqja9u87bdia/bifudizogunenofoka.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+doc+to+word+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
font_01_sfnt_off0000e945.bin
8fc99a4cf38cb60ce13e3dc28481b1ef92957948abc76b736b7eae09d503d76f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10328 bytes
font_02_sfnt_off000100c4.bin
bcbb6c59a07caa74d4aae7b57f2d72a78562f1e2b06abad49f4205639fc98e1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 17000 bytes